The self-aggregation of sodium n-hexyl sulfate (SHS) in aqueous solution has been studied from static and dynamic light scattering and H-1 nuclear magnetic resonance (NMR) at 25 degrees C in the presence of added electrolyte concentration (0.0-0.5 mol kg(-1) NaCl). Critical concentrations, aggregation numbers, effective aggregate charges, and degrees of aggregate ionization have been calculated, with similar results from each of the different techniques. The interaction between aggregates was interpreted from diffusion data from dynamic light scattering using DLVO theory. Aggregation properties have been determined by application of mass action theory to the concentration dependence of H-1 NMR chemical shifts, confirming the results obtained by the light scattering techniques.